KR20200077196A - Apparatus for gathering concrete powder - Google Patents

Abstract

The present invention relates to an apparatus for collecting powder by fine depth from a concrete structure. More specially, the present invention relates to the apparatus for collecting powder by fine depth from the concrete structure, which enables collection of sample powder by fine depth from the concrete structure and increases the amount of a powder sample collected by depth compared to conventional one. The apparatus for collecting powder by fine depth from the concrete structure includes a drill (40), a drill fixture (10), a guide member (20), an adapter (30), an adjusting means, and a clamping means.

Description

Powder collection device for each fine depth of concrete structures{Apparatus for gathering concrete powder}

The present invention relates to a powder collecting device for each fine depth of a concrete structure, in particular, it is possible to collect the sample powder for each fine depth from the concrete structure and also to increase the amount of powder sample collected by depth than the conventional It relates to a powder collection device for each fine depth of the structure.

Currently, many concrete structures are being built under harmful environments, and studies to secure the performance and stability of concrete structures related to this are underway.

The concrete structure built in the marine environment penetrates into the concrete as the seawater and airborne salinity increases, and the severity of rebar corrosion has been steadily raised.

Sulfuric acid can penetrate the concrete surface and increase the corrosion and deterioration of concrete in hazardous environments such as factories, power plants, and underground buried structures.

In addition, in a large city with a densely populated environment, the concentration of carbon dioxide gas in the atmosphere is constantly rising, so that the carbonation of concrete is promoted and calcium hydroxide is consumed and calcium carbonate is generated, so the pH of the pore water decreases and corrosion of the rebar proceeds.

When such corrosion of the rebar occurs, cracking and dropping of the concrete structure may occur due to an increase in internal stress, and the structural stability problem is directly related to the loss of the reinforcing bar due to the corrosion of the reinforcing bar.

Accordingly, although studies have been actively conducted on methods for measuring the residual amount of calcium hydroxide and the amount of calcium carbonate produced, and the amount of sulfuric acid and chloride by carbon dioxide gas, which are the main factors of rebar corrosion in concrete, the process of collecting and measuring cured concrete samples There is a hassle of, and there is no special provision for a conversion method according to the result of the measurement method.

Typically, in order to evaluate the durability life of a reinforced concrete structure, it is necessary to predict the corrosion time of the reinforcing bar and the residual life of the structure in the reinforced concrete structure.

Since the deterioration of the durability of concrete is the main cause that harmful substances penetrate from the surface of concrete and reach the position of the reinforcing bar to generate reinforcing bar, it is very important to grasp the amount of harmful substances per minute depth from the surface.

To this end, pulverized samples are obtained individually from samples collected from reinforced concrete structures, and the amount of harmful substances contained in the obtained pulverized samples is measured and analyzed to evaluate the endurance life of actual reinforced concrete structures.

As a test method for the content of such harmful substances, there are a powder sample collection method and a core collection method using an electric drill.

An example of a powder sample collection module by an electric drill is disclosed in Korean Patent Registration No. 10-1743970 and is shown in FIG. 1.

This consists of a sample collection tube 110, a telescopic bellows tube 120 and a fastening portion 130 for fixing the electric drill 200, and the telescopic guide rod 140 and the length measurer 150 along the longitudinal direction It has a structure installed in the sample collection container (110).

The sample collection module 100 having the above-described configuration is fastened to the drill head of the electric drill 200, and advances the drill bit 220 of the electric drill 200 to puncture and crush the concrete structure 300, thereby grinding powder. Allow 310 to be taken as a sample for concrete chloride testing.

The sample collection module 100 may be provided with a telescopic bellows container 120 to prevent dust from being scattered and to promote worker safety.

However, the sampling module 100 as described above has the following problems.

First, since the drill bit 220 of a small diameter is pulverized while drilling the concrete structure 300 to collect the grinding powder 310, the amount of the harvested grinding powder 310 is small and there are a small amount of holes to drill the grinding powder. There is a hassle to collect 310.

Second, the durability of the concrete structure should be evaluated by measuring and analyzing the amount of chloride contained in each of the depths of the concrete structure 300 by separately collecting the grinding powder 310 for each depth. to do,

The sample collection module 100, while observing the length measurer 150, the operator presses the electric drill 200 to puncture the concrete structure 300, for example, to collect samples in a fine depth unit of about 0.5 to 1 mm There are difficult problems.

That is, the reliability of the endurance life evaluation increases as the sampling depth interval is decreased, but the endurance life evaluation of the sample collection module 100 cannot be expected.

Korean Patent Registration No. 10-1743970 Korean Patent Publication No. 10-2012-0103172 Korean Patent Registration No. 10-1858738

The present invention was created in order to solve the above-described problems, and it is possible to collect sample powders by fine depth from a concrete structure, and also to increase the amount of powder samples collected by depth than the prior art. The purpose of the present invention is to provide a powder collecting device for each fine depth.

A powder collecting device for each fine depth of the concrete structure of the present invention for achieving the above object includes a drill bit, a drill body rotatably supporting the drill bit, and a drill having a driving unit for rotating the drill bit;

A drill fixing body formed as a hollow type, in which the drill body is accommodated and fixed therein, and a hollow lower coupling part is formed at a lower end of the fixing body so that an end of the drill bit protrudes;

The lower plate in close contact with the upper surface of the concrete structure and having a lower hole in the center, and an upper plate disposed on the upper side of the lower plate and having an upper hole relatively larger than the lower hole in the center, and a side plate connecting the edges of the lower plate and the upper plate. And a guide member having a;

An adapter having a hollow upper coupling portion detachably coupled with the lower coupling portion on an upper side, and having a flange movably coupled between the lower plate and the upper plate at an edge of the lower portion of the upper coupling portion;

Adjusting means for adjusting the protruding length of the drill bit protruding to the lower side of the flange;

With a clamping means for closely fixing the guide member to the concrete structure,

It is characterized in that the concrete is collected by grinding the upper surface of the concrete structure while moving the drill bit within the area of the lower hole.

In addition, in the device of the present invention, the adjusting means is such that the lower coupling portion and the upper coupling portion are screwed to each other, so that the protruding length of the drill bit becomes longer as the upper coupling portion is forwardly coupled to the lower coupling portion. It is characterized by.

In addition, in the device of the present invention, the adjustment means is the lower coupling portion is formed separately from the fixed body, the upper portion of the lower coupling portion and the fixed body is screwed to each other,

The lower end of the lower coupling portion and the upper coupling portion are screwed together,

First adjust the protruding length of the drill bit protruding to the lower portion of the lower coupling portion according to the screw coupling length of the lower coupling portion coupled to the fixed body,

It is characterized in that the protruding length of the drill bit protruding to the lower portion of the flange can be adjusted secondly according to the screw coupling length of the upper coupling part coupled to the lower coupling part.

First, it is possible to finely adjust the protruding length of the drill bit 41 by rotating the adapter 30, thereby enabling powder extraction for each fine depth of the concrete structure 1.

Second, since the drill fixing body 10 and the adapter 30 are guided to the guide member 20, it is possible to obtain a stable sample powder,

While moving the drill bit 41 within the area of the lower hole 21a of the lower plate 21, the upper surface of the concrete structure 1 can be ground to collect powder, so that a larger amount of powder sample than the prior art can be obtained at the same depth. To get it.

Third, the collected powder is surrounded by the surface of the concrete structure 1, the guide member 20 and the adapter 30, so that it is prevented from leaking to the outside, preventing contamination of the working space and the sample powder. It is possible to prevent loss.

1 is a multi-sectional view showing a conventional concrete sampling module,
Figure 2 is a cross-sectional view showing a concrete sample powder collecting device of the embodiment of the present invention,
Figure 3 is a cross-sectional view showing another example of the clamping means applied to the powder collecting device of the embodiment of the present invention,
4A to 4C are schematic diagrams illustrating the use state of the present invention collecting device,
5 is a cross-sectional view showing another example of the collecting device of the present invention.

The powder collecting device for each fine depth of the concrete structure of the embodiment of the present invention enables the collection of the sample powder for each fine depth from the concrete structure and also increases the amount of the powder sample collected for each depth than in the prior art.

Referring to Figures 1 to 3 showing the concrete powder collecting device of the embodiment of the present invention, it is composed of a drill 40, a drill fixture 10, an adapter 30, a guide member 20 and a clamp 50 .

The drill 40 includes a drill bit 41, a drill body 42 rotatably supporting the drill bit 41, and a driving unit for rotationally driving the drill bit 41.

The drill fixing body 10 is hollow, and the drill body 42 is accommodated therein and fixed to the fixed body 11 and extends from the bottom of the fixed body 11 and ends of the drill bit 41 The hollow lower coupling portion 12 is disposed so as to protrude.

A handle 13 for an operator to grip may be formed on the outer surface of the fixed body 11.

The guide member 20 is in close contact with the upper surface of the concrete structure 1, the lower plate 21 is formed with a lower hole 21a in the center, and is disposed on the upper side of the lower plate 21 and the lower hole 21a in the center. ) Is provided with a top plate 22 having a relatively larger upper hole 22a, and a side plate 23 connecting the lower plate 21 and the edges of the top plate 22.

The adapter 30 is formed with a hollow upper coupling portion 31 detachably coupled with the lower coupling portion 12 on the upper side, and the lower plate 21 and the lower edge of the upper coupling portion 31 It has a flange 32 that is movably coupled between the top plate (22).

That is, the adapter 30 can be moved in any direction inside the guide member 20.

In addition, the collecting device of the present invention is an adjustment means for adjusting the protruding length of the drill bit 41 protruding to the lower side of the flange 32 and the guide member 20 to be fixed in close contact with the concrete structure 1 It is provided with a clamping means (50).

4A and 4B, the lower coupling portion 12 and the upper coupling portion 31 are screwed together, so that the upper coupling portion 31 is upper side to the lower coupling portion 12. As it is coupled forward, the protruding length of the drill bit 41 is increased.

Referring to FIG. 5 showing another embodiment of the adjusting means, unlike the embodiment of FIG. 4, the lower coupling part 12 is formed separately from the fixed body 11, and the lower coupling part 12 The upper end portion and the fixed body 11 is screwed to each other.

This adjustment means is to adjust the protruding length of the drill bit 41 protruding to the lower portion of the lower coupling portion 12 according to the screw coupling length of the lower coupling portion 12 coupled to the fixed body 11 1 Secondary adjustment, and secondary adjustment of the protruding length of the drill bit 41 protruding to the lower portion of the flange 32 according to the screwing length of the upper coupling part 31 coupled to the lower coupling part 12 Make it possible.

According to this embodiment, by adjusting the protruding length of the lower coupling portion 12 with respect to the fixed body 11 according to the length of the drill bit 41 mounted on the drill 40, the drill bits of various lengths 41 ) To be used.

Referring to FIG. 2, the clamping means is obtained by cutting the specimen block 1a from the concrete structure 1 and then placing the specimen block 1a between the guide member 20 and the fixture 60. In the fastening bolt 50 is fastened and fixed.

Referring to FIG. 3 showing another example of the clamping means, this is to allow the concrete powder to be taken directly from the concrete structure 1, thereby fixing the anchor bolt 51 to the concrete structure 1, and the anchor bolt ( The guide member 20 is fastened and fixed to 51).

The collecting device of the above configuration is used as follows.

First, as shown in FIGS. 2 and 3, the guide member 20 is clamped to be in close contact with the concrete specimen block 1a or the concrete structure 1.

At this time, it is preferable to attach an elastic sheet (not shown) to the bottom surface of the guide member 20 to absorb vibration when driving the drill 40 and prevent leakage of the collected powder.

Subsequently, the drill 40 is coupled to the drill fixture 10, and the adapter 30 is rotated with respect to the lower coupling portion 12 to adjust the protruding length of the drill bit 41.

At this time, the protruding length of the drill bit 41 is adjusted in increments of 0.5 to 1 mm so that sample powder can be collected for each fine depth.

Subsequently, the flange 32 of the adapter 30 is coupled to the guide member 20, and power is applied to the drill 40 to collect sample powder.

At this time, while moving the drill 40, the drill fixture 10 and the adapter 30 in an arbitrary direction to extract concrete powder, the drill bit 41 is moved within the area of the lower hole 21a While grinding, the concrete surface is collected by grinding the upper surface of the concrete structure 1.

The collected powder is surrounded by a surface of the concrete structure 1, a guide member 20, and an adapter 30, so that it is prevented from leaking to the outside, preventing contamination of the work space and loss of sample powder It is possible to prevent.

As shown in Figure 4a, when the extraction of the powder to the initial adjusted length of the drill bit 41 is completed, the adapter 30 is separated from the guide member 20 and the collected powder is collected.

Subsequently, as shown in FIG. 4B, the adapter 30 is rotated to lengthen the protruding length of the drill bit 41, and then coupled to the guide member 20 to perform the powder collection operation as described above.

As described above, it is possible to finely adjust the protruding length of the drill bit 41 by rotationally adjusting the adapter 30 so that powder can be collected for each fine depth of the concrete structure 1.

In particular, in the embodiment of the present invention, since the drill bit 41 is moved within the area of the lower hole 21a of the guide member 20, the upper surface of the concrete structure 1 is ground to collect concrete powder. , To increase the amount of concrete powder collected at the same depth.

The above collecting device measures and analyzes the amount of chloride contained in the powder collected for each fine depth to increase the reliability in evaluating the durability of the concrete structure.

On the other hand, referring to Figure 4c, if you want to collect the sample powder at a deep location of the concrete structure (1), cut the specimen block (1a) and cut out the powder at a deep location with the powder extraction device of the embodiment of the present invention Can be easily collected.

1... concrete structure 1a... specimen block
10...Drill fixture 11...Fixed body
12... Lower coupling 20...Guide member
21...bottom 21a...bottom hole
22...top 22a...top hole
23...Side plate 30...Adapter
31...Upper part 32...Flange
40...drill 41...drill bit
50...Fixed bolt 51...Anchor bolt

Claims (3)

In the powder collecting device for each fine depth of the concrete structure,
A drill bit (41), a drill body (42) rotatably supporting the drill bit (41), and a drill (40) having a driving part for rotating the drill bit (41);
As a hollow type, a fixed body 11 in which the drill body 42 is accommodated and fixed therein, and a hollow lower coupling part arranged to protrude an end of the drill bit 41 below the fixed body 11 (12) is formed with a drill fixture (10);
The lower plate 21 in close contact with the upper surface of the concrete structure 1 and having a lower hole 21a in the center, and an upper hole disposed above the lower plate 21 and relatively larger than the lower hole 21a in the center. A guide member 20 having an upper plate 22 on which 22a is formed, and a side plate 23 connecting the edges of the lower plate 21 and the upper plate 22;
A hollow upper coupling portion 31 is formed detachably coupled to the lower coupling portion 12 on the upper side, and between the lower plate 21 and the upper plate 22 at the lower edge of the upper coupling portion 31. An adapter 30 having a flange 32 that is movably coupled;
Adjusting means for adjusting the protruding length of the drill bit 41 protruding to the lower side of the flange 32;
Clamping means for closely fixing the guide member 20 to the concrete structure 1;
Powder collecting device for each fine depth of a concrete structure, characterized in that the drill bit (41) is moved within the area of the lower hole (21a) to grind the top surface of the concrete structure (1) to collect concrete powder. . The method according to claim 1, wherein the adjusting means, the lower coupling portion (12) and the upper coupling portion (31) are screwed together, so that the upper coupling portion (31) can be coupled forward to the lower coupling portion (12). Collecting powder collecting device for each fine depth of the concrete structure, characterized in that the protruding length of the drill bit (41) becomes longer. The method according to claim 1, The adjustment means,
The lower coupling portion 12 is formed separately from the fixed body 11, the upper end of the lower coupling portion 12 and the fixed body 11 is screwed to each other,
The lower end portion of the lower coupling portion 12 and the upper coupling portion 31 are screwed together,
The protruding length of the drill bit 41 protruding to the lower portion of the lower coupling portion 12 is first adjusted according to the screw coupling length of the lower coupling portion 12 coupled to the fixed body 11,
According to the screw coupling length of the upper coupling portion 31 coupled to the lower coupling portion 12 is to allow the secondary adjustment of the protruding length of the drill bit 41 protruding to the lower portion of the flange 32 Powder collection device for each fine depth of a concrete structure.

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